Aarch64 ASM: check CPU features before hw crypto instr use

[SparkiDev]

Description

For SHA-256, SHA-512 and SHA3, get the CPU features to see if hardware crypto is available. If not then fallback to an alternate implementation.

Testing

Regression tested Aarch64 and ARM32 assembly code.

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

[dgarske]

This is great work! Getting much closer. This gets past the SHA2/SHA3 now. We could merge this change as-is.

It's the AES GCM failing next.

Program received signal SIGILL, Illegal instruction.
0x0000005555638b6c in GMULT_AARCH64 (X=0x7ffffff250 "\376\355\372\316ޭ\276\357\376\355\372\316ޭ\276", <incomplete sequence \357>,
    Y=0x7fffffef70 "\254\276\362\005y\264\270\353Έ\233\254\207\062\332", <incomplete sequence \327>) at wolfcrypt/src/port/arm/armv8-aes.c:1513
1513	    __asm__ volatile (
(gdb) bt
#0  0x0000005555638b6c in GMULT_AARCH64 (X=0x7ffffff250 "\376\355\372\316ޭ\276\357\376\355\372\316ޭ\276", <incomplete sequence \357>,
    Y=0x7fffffef70 "\254\276\362\005y\264\270\353Έ\233\254\207\062\332", <incomplete sequence \327>) at wolfcrypt/src/port/arm/armv8-aes.c:1513
#1  0x000000555562f96c in GHASH_UPDATE (aes=0x7fffffee40, a=0x7fffffe998 "\376\355\372\316ޭ\276\357\376\355\372\316ޭ\276\357\253\255\332", <incomplete sequence \322>, aSz=20,
    c=0x7fffffe758 "R-\301\360\231V}\a\364\177\067\243*\204B}d:\214ܿ\345\300\311u\230\242\275%UѪ\214\260\216HY\r\273=\247\260\213\020V\202\210\070\305\366\036c\223\272z\n\274\311\366b", cSz=60)
    at wolfcrypt/src/aes.c:8063
#2  0x00000055556310b4 in wc_AesGcmEncryptUpdate (aes=0x7fffffee40,
    out=0x7fffffe758 "R-\301\360\231V}\a\364\177\067\243*\204B}d:\214ܿ\345\300\311u\230\242\275%UѪ\214\260\216HY\r\273=\247\260\213\020V\202\210\070\305\366\036c\223\272z\n\274\311\366b",
    in=0x7fffffe9b0 "\331\061\062%\370\204\006\345\245Y\tů\365&\232\206\247\251S\025\064\367\332.L0=\212\061\212r\034<\f\225\225h\tS/\317\016$I\246\265%\261j\355\365\252\r\346W\272c{9", sz=60,
    authIn=0x7fffffe998 "\376\355\372\316ޭ\276\357\376\355\372\316ޭ\276\357\253\255\332", <incomplete sequence \322>, authInSz=20) at wolfcrypt/src/aes.c:10343
#3  0x0000005555577274 in aesgcm_test () at wolfcrypt/test/test.c:15581
#4  0x000000555555d560 in wolfcrypt_test (args=0x7ffffff340) at wolfcrypt/test/test.c:2016
#5  0x000000555555e1a4 in wolfcrypt_test_main (argc=1, argv=0x7ffffff4c8) at wolfcrypt/test/test.c:2609
#6  0x000000555555e0d4 in main (argc=1, argv=0x7ffffff4c8) at wolfcrypt/test/test.c:2517
(gdb)